九月二十八Java学习

public class InstanceCounter {

private static int numInstances = 0;

protected static int getCount() {

return numInstances;

}

private static void addInstance() {

numInstances++;

}

InstanceCounter() {

InstanceCounter.addInstance();

}

public static void main(String[] arguments) {

System.out.println("Starting with " + InstanceCounter.getCount() + " instances");

for (int i = 0; i < 500; ++i){

       new InstanceCounter();

      }

System.out.println("Created " + InstanceCounter.getCount() + " instances");

}

}